Oil-pump.



A. LOOMIS.

OIL PUMP.

APPLICATION F lLED .MAY 19. I909.

Patented Aug. 17, i915.

A Q Q Iii L fitter/nu auser.

PA NT OFFICE.

ALLEN 13001513, F DETROIT, MICHIGAN, ASSIGNOR, BY MESNE ASSIGNMENTS, TOPACKARD MOTQB CAR COMPANY, OF DETROIT, MICHIGAN, A CORPORATIONOFMICHIGAN.

OIL-PUMP.

Specification of Letters Patent.

Patented Aug. 17, 1915.

Application filed May 19, 1909. Serial No. 497,046.

Y zen of the United States, and resident of Detroit, in the county ofWayne and State of Michigan, have invented certain new and usefulImprovements in @il-lumps, of which the following is a specification.

This invention relates to pumps and in particular to oil pumps used inconnection with hydrocarbon motors and of the type described and shownin patent to Huff No. 904,434, dated November 17, 1908.

In "hydrocarbon motors, particularly when used to drive motor vehicles,it is desirable to constantly feed a supply of oil to the crank case orother parts of the motor, and, as the supply necessary when the m0- toris running slowly is very little, some difficulty is experienced inpumping the oil in quantities suiliciently small and at the same timemaintaining a constant and accurate supply.

In multicylinder pumps which supply the oil to different parts of theengine mechanism, a single operating means is used to-operate theseveral plungers or pistons, and in order that the supply delivered byeach cylinder may be varied each plunger is probe varied. Such plungeroperating means ,7 pear in the following description.

' means.

vided with a separate adjusting means whereby the movement of theplunger may usually permits the operating means to 0perate withconsiderable lost motion so that the plungers will be moved only nearthe ends of the reciprocation of the operating Therefore when theplungers are operated by a crank and a connecting rod this effectiveoperative movement takes place at thp time when the crank is near deadcenterggand therefore when the reciprocating head travels at the lowestspeed. With the plungers operating at such low speed particularly whenthe motor is running at a low speed the supply of oil delivered isvariable, especially when the parts become worn.

One of the objects of the present invention is to insure the quickreciprocation of the pump plunger regardless of the amount of lostmotion between the plungers and their reciprocating means.

Qther objects of the invention will ap- In the drawings: Figure 1 is avertical section through. the pump embodying this invention; Fig; 2 isan elevation of the same w th one of the valves shown in section; andFig. 3 1s a detail view of the operating cam and the connecting rod.

Referring to the drawings, 10 designates a fragment of a crank casing;11 a cam shaft which is driven in a ratio of two to one from the crankshaft and having fixed to it a worm 12. k

13 designates the pump casing which is provided with a boss 14 extendingthrough an aperture in the crank casing, the pump casing being providedwith extensions whereby it may be bolted to the crank casing by means ofbolts 14, as shown in Fig. 2. 'The shaft 15 is mounted in the pumpcasing and extends through the boss ifito the.

crank case. A worm wheel 16 mounted upon-the shaft 15 'meshes with theworm 12. A pinion 17 is secured to or' integrally formed with the shaft15 and meshes with a spur gear 18 suitably secured to an operating shaft19 which as shown in Fig. 1 is rotatably mounted in the pump casing. Bymeans of the train of gears shown in Fig. 1 the operating shaft 19 isdriven from the cam shaft 11 at a low speed.

The pump casing is provided with a number of pump chambers 20, 20 inwhich opcrate pump plungers 21, 21. These pump plungers are driventhrough the connecting rod 22 by means of a cam on the operating shaft19 as hereinafter described. Adjusting screws 23, 23 permit independentad- 27 A triangular cam 28 is eccentrically 10 mounted upon the shaft 19and is located w1th1n the square opening formed in the connecting rod.The triangular cam is rounded as shown and is of such a constructionthat the cam and connecting rod will always contact at three points..-

From the above it will be seen that the connecting rod will be movedfrom the position shown in Figs. 2 and 3 first slightly to' one side andthence downwardly by a.

quick movement due to the eccentricity of thecam 28. Then there will bea dwell in the downward movement of the connecting rod while it is beingmoved to the other side then there will be a quick upward move: ment,and lastly a corresponding dwella's the connectingl od is being movedlaterally again. Hence the up and down movement of the connecting rodwill be quicker than if it were mounted on a crank upon the operatingshaft, and this quick moveinent will take place near the ends of thenievement of the cam. Since the cam and c nnecting rod are always inengagement atat least three points the cam performs the double functionof an operating cam and a guiding means or the connecting rod wherebyauxiliary uides are dispensed with. It is also 'to be noted that thevelocity of the plungers will is provided with a flange 31.

be the same in both directions whereby it is insured that the properamount of oil is drawn from the supply pipe and discharged into thedischarge pipe.

The pump casing is provided with ran opening 29 which is interiorlythreaded. A threaded cap 30 screws into this opening and The cap isprovided with an annular depression 32 Altliou'gh the cam 28 is shown inthe form of a triangular cam it is apparent that this 35 cam need notnecessarily be of triangular construction to impart a quick movement tothe connecting rod and pistons near the end of the movement of the camand to guide the connecting rod in its movements, 40 and it is to befurther understood that this invention is not to be limited to thespecific construction shown and described.

"WVhat I claim is:

In a pumpfin combination, a piston, an operating shaft having a cam and.a gear mounted thereon a casing surrounding all of said parts, and aremovable externally threaded cap constructed to screw into the casingand bear against one face of the gear.

